💫 Sh2-200
Object data
| Type | Emission nebula |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 3h10m45.1s (47.6880°) |
| Declination | +62°48'56" (+62.8155°) |
| Magnitude | (no magnitude data) |
| Apparent size | 6′ |
| Other designations | Sh2-200 |
An emission nebula in Cassiopeia (Sharpless catalog).
Midnight transit date (best season to observe and image)
Location: Tokyo (change)
Around Nov 4, 2026
The date it transits around midnight (transit altitude about 63°)
For about 2–3 weeks either side of this date, the object stays high from evening to dawn — its observing season.
Best time to observe tonight
Tonight (Oct 12 evening – Oct 13 dawn) · Location: Tokyo (full darkness = end of astronomical dusk to start of dawn, altitude ≥ 15°)
Moon tonight: Waxing crescent (age 1.1 days, 1% illuminated) — Little moonlight — a good time for faint objects
Oct 12 18:35 – Oct 13 4:20
Hours of full darkness (end of astronomical dusk to start of dawn) when it is above 15° — the darkest sky, mostly clear of buildings and trees.
Night (sunset – sunrise)
Full darkness (dusk – dawn)
Moon up (darker = brighter moon)
Best time to observe (thick line)
Now
Sunset 17:10 → Dusk 18:35 → Dawn 4:20 → Sunrise 5:45